In a similar fashion, the emerald Rise of the Floodborn card can be played for three ink or nothing, depending on if you have a character costing three ink or more that can sing it, in order to return a character of your choice from your hand in order to play different one of the same cost or less for free
Saga Enchantments: tells the story of a key event from the plane's past, and it progresses on each of your turns
Other times you can get several in exchange for a brand-new bulk rare
I've seen lots of great Green/White decks over the years and have even had a little fun with the likes of Nazahn, Revered Bladesmith, Arahbo, Roar of the World and Yasharn, Implacable Earth
END STEP So, thats my take on the Sultai Arisen deck and how best to upgrade it
But the easy winners here are Heroic Intervention, a way to protect your entire board from a wipe, and Cyclonic Rift - ironically one of the few board wipes that can get around Heroic Intervention